Method of mounting a vibrating diaphragm.



A. HAYES.

METHOD OF MOUNTING A VIBRATING DIAPHRAGM.

'. APPLIOATIONIILBD 11112.13, 191a. v 1,061,072." Patented May 6, 1913.-

Hayes;

INVENTOB f UNITED psTAtrEsrntrENT OFFICE.

Amine/1r" HAYES, or sewn ax s err UTAH. I

mn'rizon or Moonrise"; vmitn'rme DIAPHRAGM.

To all whom it may whom,

' by the vibration of a. diaphragm, and the invention 'has for its object to increase the sensitiveness of suchdiaphragms and to thus secure improved results in the reproduction-iof-sounda 7 With these objects in view my invention consists in the method hereinafter described and claimed.

Referring to the drawings: Figure 1 is a central vertical sectional View of a sound' box adapted to carry out my invention, taken on the line of the lever by vWhich the diaphragm is vibrated; .Fig. 2 is a central.

vertical sectional. view on a line at rightangles to that on which Fig. 1 is taken;

and, Fig, 3-is a plan view of the sound box partly broken away.

In the drawings 1 indicates the ,body of the sound box having 'central opening 2 in which is received the end of .the horn or sound tube (not shown), .This body l-has at its periphery a flange 3; -Within the chamber formed by the flange 3 concentrio with the opening 2 is'a ring 51, the face of which is dressed .ofi and is throughout in the same lane, which plane is at right. angles witht e axis of the body 1.

Between the ring 4 and the .fiange 3 is a depressed annular channel 5 which is SO formed that it is deeper, relative to the plane of the face of the ring- 4, on one side, of the axis 'of the sound box than 'on the other so that portions of the bottom of the annular channel 5- are' in" two' difierent' planes with a shoulder' 5' between them with the result that whenthe'disk is forced down as hereinafter described a kink or bend will be formed in 'on'the line of the shoulders 5'.

On one side the flange-is cut away and is I Specification 0! Letters Patent. 1 Application med irmh' 13, 1913. serial no, 754,063.

I provided at" Be it known that, I, ALBERT HAYES, a.

' Patented May 6, 1913.

tion with lugs 7, preferably adjustable in the lugs, to form the bearings for the trunnions- 8 of a lever 9, the outer arm-10 of which is provided with a socket to receive the needle or'stylus (not shown) a set screw 11 being provided for holding the needle in position. The inner arm 12 of lever 9 extends i'nto'line with the centeriof the opening Qand at its inner end is bent toward said opening as shown the ends of the cut away por- 6, each of which isprovided with an inwardly extending bearing pomt' at 13. To the inner end of the arm 13' is rigidly secured a disk 14, preferably of mica, of a diameter slightly less than the interior diameter of the flange3, and provided on its periphery with a ring 15 of semi-hard rubber, that is rubber which has been vulcanized sufficiently to make it harder than 'soft rubber. This'ring 15- envelops the periphery of the disk ;so'-a's .to

form a somewhat compressible ring above it and below it. v 7

16 indicates a clamping ring secured to,

the flange 3 by screws 17 and having an inwardly extending annular shoulder 18 adapt;

ed to fit over and upon the-ring 15 to force it downward so that the portion of the ring below the periphery of the disk 14 will be pressed firmly against the bottom of the annular channel?) throughout its two portlons so that the disk '14 will be so forced or distorted out of a plane parallel with the dressed face of ring 4 that oneportion will be lower than the other" and a link or bendwill be formed in it on the line of the, sho'ul- I The lever 9 being rigidly held by the bear mg points .7 against any twisting, and the end "of the arm 13 being rigidly secured to the center of the, diaphragm disk, and the eriphery 1 of the diaphragm disk being 7 ower on one side than on the other it necessarily followsthat the center portion of the disk will' be bowed or distorted. as shown in F1g.- 2. ,By reason of this bowing or distortion. ofthe diaphragm it is not only stiffened but. it is. given a considerable resilience so'that when acted on by the lever 9 to cause it towv'ibr'ate it will return quickly to IIOIIIlE-IPOSIUOD and will aid in restoring the lever to normal position or state of rest.

The action of the groove of the record on the needle or stylus is thus aided by the spring of the diaphragm. N0 suchspring action is possible where the diaphragm is so held at it's periphery as to be free to be vibrated bodily as in the ordinary arrangement. In the arrangement herein shown and described the diaphragm disk being firmly held at its periphery the only movement permitted is a vibration of the central portion of the disk and this movement of 'I claim is:

the vibration is permitted only by -reason of' the kink, bend or offset given to the disk as above described as a flat disk clamped at its periphery-could not be. vibrated 'to' a satisfactory extent by force applied at. its; center. V 1

It will, of course, be understood that the. disk 14' is not'at any time in contact wit-h the dressed face of ring 4;.

The trunnions 8 are; rigidly" held by the) bearing points? against any lateral or ver: tical movement so that the forcing of the periphery of the disk 14 into a plane out of that parallel to the face of the ring 4 cani not cause any distortion of the lever 9.

By reason of the projection of the ring.

:4 above the'plane of the bottom of annular channel 5 the lower portion of the com-- pressible ring 15 isheld against inward expansion where pressure is brought" to bear upon the ring. a

It will, of course, be understood that I1 do not desire to be limited to the precise construction and arrangement shown and described as it will be obvious that my method may be carried out by apparatus 'difiering from that shown and described in details of construction and arrangement.

It will also be understood that I do not herein claim theconstruction of sound box herein shown and'described as that is claimed in a separate application filed by me on March 8, 1913, SerialNo.'732,885.

Having thus described my invention what 1. The herein described method of mounting a vibrating diaphragm which consists in clamping a diaphragm at its periphery against a surface oneportion of which is out of the plane of anotherportion so that a. part of the central portion of the diaphragm isforced out of the plane of another portion of said central portion along a diametrical line, and applying vibrating means to the central portion of the diaphragm.

2. The herein described method of mounting .2 vibrating diaphragm which consists in so clamping a diaphragm at its periphery that one portion thereof will be out of the (ioples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

